Element-wise Copy of String with Uppercase to Lowercase in NumPy

To return element-wise a copy of the string with uppercase characters converted to lowercase and vice versa, use the numpy.char.swapcase() method in Python Numpy. For 8-bit strings, this method is locale-dependent.

The function swapcase() returns an output array of str or unicode, depending on input type. The numpy.char module provides a set of vectorized string operations for arrays of type numpy.str_ or numpy.bytes_.

Steps

At first, import the required library −

import numpy as np

Create a One-Dimensional array of strings −

arr = np.array(['Katie', 'JOHN', 'Kate', 'AmY', 'brADley'])

Displaying our array −

print("Array...
",arr)

Get the datatype −

print("
Array datatype...
",arr.dtype)

Get the dimensions of the Array −

print("
Array Dimensions...
",arr.ndim)

Get the shape of the Array −

print("
Our Array Shape...
",arr.shape)

Get the number of elements of the Array −

print("
Elements in the Array...
",arr.size)

To return element-wise a copy of the string with uppercase characters converted to lowercase and vice versa, use the numpy.char.swapcase() method −

print("
Result (swapcases)...
",np.char.swapcase(arr))

Example

import numpy as np

# Create a One-Dimensional array of strings
arr = np.array(['Katie', 'JOHN', 'Kate', 'AmY', 'brADley'])

# Displaying our array
print("Array...
",arr)

# Get the datatype
print("
Array datatype...
",arr.dtype)

# Get the dimensions of the Array
print("
Array Dimensions...
",arr.ndim)

# Get the shape of the Array
print("
Our Array Shape...
",arr.shape)

# Get the number of elements of the Array
print("
Number of elements in the Array...
",arr.size)

# To return element-wise a copy of the string with uppercase characters converted to lowercase and vice versa, use the numpy.char.swapcase() method in Python Numpy
print("
Result (swapcases)...
",np.char.swapcase(arr))

Output

Array...
['Katie' 'JOHN' 'Kate' 'AmY' 'brADley']

Array datatype...
<U7

Array Dimensions...
1

Our Array Shape...
(5,)

Number of elements in the Array...
5

Result (swapcases)...
['kATIE' 'john' 'kATE' 'aMy' 'BRadLEY']